2008 class immediate impact?

Does anyone have any information on the 2009 depth chart, and specifically on the type of impact to expect from the incoming freshman class. The roster has several gaping holes left from outgoing players. From what I've seen of the incoming players, several of them I believe have the skillset to come in and benefit the team; however whether or not they will be given the opportunity is still in question. Our position of greatest concern on my part is the o-line. With the exits of long, boren, and kraus we are in desperate need of a player to step it up and hold down the line. Dan Oneal is projected to be a solid tackle of the future. Is he going to be playing many downs in the upcoming season. How about Brandon Smith? We lost two of our starting safeties whose spots, in my opinion, have not been solidly claimed by any of the young backups. I've heard some about the possibility for Stonum to step in and play immediately. Are Fitzgerald or Witherspoon in the running to fill the Crable hole? Im certainly curious about the tailback situation. We have several solid incoming freshman in McGuffie, Cox, Shaw, and Robinson (projected slot reciever.) However we also have at least four upperclassmen still battling for carries: Grady, Brown, Minor, Horn. Are the freshman rb's being considered at this point or should we expect the oldies to take all of the carries? Who from this class is projected to redshirt?